interface/spr2.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
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/* without modification, are permitted provided that the following   */
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/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
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/*********************************************************************/

#include <stdio.h>
#include <ctype.h>
#include "common.h"
#ifdef FUNCTION_PROFILE
#include "functable.h"
#endif

#ifdef XDOUBLE
#define ERROR_NAME "QSPR2 "
#elif defined(DOUBLE)
#define ERROR_NAME "DSPR2 "
#else
#define ERROR_NAME "SSPR2 "
#endif

static int (*spr2[])(BLASLONG, FLOAT, FLOAT *, BLASLONG, FLOAT *, BLASLONG, FLOAT *, FLOAT *) = {
#ifdef XDOUBLE
  qspr2_U, qspr2_L,
#elif defined(DOUBLE)
  dspr2_U, dspr2_L,
#else
  sspr2_U, sspr2_L,
#endif
};

#ifdef SMP
static int (*spr2_thread[])(BLASLONG, FLOAT, FLOAT *, BLASLONG, FLOAT *, BLASLONG, FLOAT *, FLOAT *, int) = {
#ifdef XDOUBLE
  qspr2_thread_U, qspr2_thread_L,
#elif defined(DOUBLE)
  dspr2_thread_U, dspr2_thread_L,
#else
  sspr2_thread_U, sspr2_thread_L,
#endif
};
#endif

#ifndef CBLAS

void NAME(char *UPLO, blasint *N, FLOAT  *ALPHA,
	 FLOAT  *x, blasint *INCX, FLOAT *y, blasint *INCY, FLOAT *a){

  char uplo_arg = *UPLO;
  blasint n		= *N;
  FLOAT alpha	= *ALPHA;
  blasint incx	= *INCX;
  blasint incy	= *INCY;

  blasint info;
  int uplo;
  FLOAT *buffer;
#ifdef SMP
  int nthreads;
#endif

  PRINT_DEBUG_NAME;

  TOUPPER(uplo_arg);
  uplo  = -1;

  if (uplo_arg  == 'U') uplo  = 0;
  if (uplo_arg  == 'L') uplo  = 1;

  info = 0;

  if (incy == 0)          info =  7;
  if (incx == 0)          info =  5;
  if (n < 0)              info =  2;
  if (uplo  < 0)          info =  1;

  if (info != 0) {
    BLASFUNC(xerbla)(ERROR_NAME, &info, sizeof(ERROR_NAME));
    return;
  }

#else

void CNAME(enum CBLAS_ORDER order,
	   enum CBLAS_UPLO Uplo,
	   blasint n,
	   FLOAT alpha,
	   FLOAT  *x, blasint incx,
	   FLOAT  *y, blasint incy,
	   FLOAT  *a) {

  FLOAT *buffer;
  int uplo;
  blasint info;
#ifdef SMP
  int nthreads;
#endif

  PRINT_DEBUG_CNAME;

  uplo = -1;
  info =  0;

  if (order == CblasColMajor) {
    if (Uplo == CblasUpper)         uplo  = 0;
    if (Uplo == CblasLower)         uplo  = 1;

    info = -1;

    if (incy == 0)          info =  7;
    if (incx == 0)          info =  5;
    if (n < 0)              info =  2;
    if (uplo  < 0)          info =  1;
  }

  if (order == CblasRowMajor) {
    if (Uplo == CblasUpper)         uplo  = 1;
    if (Uplo == CblasLower)         uplo  = 0;

    info = -1;

    if (incy == 0)          info =  7;
    if (incx == 0)          info =  5;
    if (n < 0)              info =  2;
    if (uplo  < 0)          info =  1;
  }

  if (info >= 0) {
    BLASFUNC(xerbla)(ERROR_NAME, &info, sizeof(ERROR_NAME));
    return;
  }

#endif

  if (n == 0) return;

  if (alpha == ZERO) return;

  if (incx == 1 && incy == 1 && n < 50) {
    blasint i;
    if (!uplo) {
      for (i = 0; i < n; i++){
        AXPYU_K(i + 1, 0, 0, alpha * x[i], y,     1, a, 1, NULL, 0);
        AXPYU_K(i + 1, 0, 0, alpha * y[i], x,     1, a, 1, NULL, 0);
        a += i + 1;
      }
    } else {
      for (i = 0; i < n; i++){
	AXPYU_K(n - i, 0, 0, alpha * x[i], y + i, 1, a, 1, NULL, 0);
        AXPYU_K(n - i, 0, 0, alpha * y[i], x + i, 1, a, 1, NULL, 0);
        a += n - i;
      }
    }
    return;
  }

  IDEBUG_START;

  FUNCTION_PROFILE_START();

  if (incx < 0 ) x -= (n - 1) * incx;
  if (incy < 0 ) y -= (n - 1) * incy;

  buffer = (FLOAT *)blas_memory_alloc(1);

#ifdef SMP
  nthreads = num_cpu_avail(2);

  if (nthreads == 1) {
#endif

  (spr2[uplo])(n, alpha, x, incx, y, incy, a, buffer);

#ifdef SMP
  } else {

    (spr2_thread[uplo])(n, alpha, x, incx, y, incy, a, buffer, nthreads);

  }
#endif

  blas_memory_free(buffer);

  FUNCTION_PROFILE_END(1, n * n / 2 + 2 * n, 2 * n * n);

  IDEBUG_END;

  return;
}